 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.text.edits;

 import org.eclipse.jface.text.BadLocationException;
 import org.eclipse.jface.text.IDocument;

 /**
  * Text edit to delete a range in a document.
  * <p>
  * A delete edit is equivalent to <code>ReplaceEdit(
  * offset, length, "")</code>.
  *
  * @since 3.0
  */
 public final class DeleteEdit extends TextEdit {

     /**
      * Constructs a new delete edit.
      *
      * @param offset the offset of the range to replace
      * @param length the length of the range to replace
      */
     public DeleteEdit(int offset, int length) {
         super(offset, length);
     }

     /*
      * Copy constructor
      */
     private DeleteEdit(DeleteEdit other) {
         super(other);
     }

     /*
      * @see TextEdit#doCopy
      */
     protected TextEdit doCopy() {
         return new DeleteEdit(this);
     }

     /*
      * @see TextEdit#accept0
      */
     protected void accept0(TextEditVisitor visitor) {
         boolean visitChildren= visitor.visit(this);
         if (visitChildren) {
             acceptChildren(visitor);
         }
     }

     /*
      * @see TextEdit#performDocumentUpdating
      */
     int performDocumentUpdating(IDocument document) throws BadLocationException {
         document.replace(getOffset(), getLength(), ""); //$NON-NLS-1$
 fDelta= -getLength();
         return fDelta;
     }

     /*
      * @see TextEdit#deleteChildren
      */
     boolean deleteChildren() {
         return true;
     }
 }

